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📖বীজগাণিতিক সূত্রাবলী📖 1.🚩 (a+b)²= a²+2ab+b² 2.🚩 (a+b)²= (a-b)²+4ab 3.🚩 (a-b)²= a²-2ab+b² 4.🚩 (a-b)²= (a+b)²-4ab 5.🚩 a² + b²= (a+b)²-2ab. 6.🚩 ReadMore..